leetCode題庫36 有效的數獨

題目：

判斷乙個 9x9 的數獨是否有效。只需要根據以下規則，驗證已經填入的數字是否有效即可。

數字 1-9 在每一行只能出現一次。

數字 1-9 在每一列只能出現一次。

數字 1-9 在每乙個以粗實線分隔的 3x3 宮內只能出現一次。

上圖是乙個部分填充的有效的數獨。

數獨部分空格內已填入了數字，空白格用'.'表示。

示例1：

輸入:[

["5","3",".",".","7",".",".",".","."],
["6",".",".","1","9","5",".",".","."],
[".","9","8",".",".",".",".","6","."],
["8",".",".",".","6",".",".",".","3"],
["4",".",".","8",".","3",".",".","1"],
["7",".",".",".","2",".",".",".","6"],
[".","6",".",".",".",".","2","8","."],
[".",".",".","4","1","9",".",".","5"],
[".",".",".",".","8",".",".","7","9"]
]輸出:true

輸入:[

["8","3",".",".","7",".",".",".","."],
["6",".",".","1","9","5",".",".","."],
[".","9","8",".",".",".",".","6","."],
["8",".",".",".","6",".",".",".","3"],
["4",".",".","8",".","3",".",".","1"],
["7",".",".",".","2",".",".",".","6"],
[".","6",".",".",".",".","2","8","."],
[".",".",".","4","1","9",".",".","5"],
[".",".",".",".","8",".",".","7","9"]
]輸出:false
解釋: 除了第一行的第乙個數字從 5 改為 8以外，空格內其他數字均與 示例1 相同。
但由於位於左上角的 3x3 宮內有兩個 8 存在, 因此這個數獨是無效的。

2.每行、每列、每3x3 宮可以單獨放在乙個hashset中判斷數值是否重複；

**：

public

boolean isvalidsudoku(char
board) 
for (int i=0;i<9;i++)
if(row[i].contains(board[i][j]))
if(column[j].contains(board[i][j]))
int boxindex = i/3*3 + j/3;
if(box[boxindex].contains(board[i][j]))
row[i].add(board[i][j]);
column[j].add(board[i][j]);
box[boxindex].add(board[i][j]);}}
return
true
; }

Leetcode題庫 36 有效的數獨

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